/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 *
 * This file is part of MjSip (http://www.mjsip.org)
 *
 * MjSip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MjSip is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MjSip; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 */

package org.zoolu.sip.header;


import org.zoolu.tools.Parser;
//import org.zoolu.sip.provider.SipStack;


/** SIP Header Max-Forwards
 * The Max-Forwards header field serves to limit the number of hops a
 * request can transit on the way to its destination.  It consists of an
 * integer that is decremented by one at each hop.  If the Max-Forwards
 * value reaches 0 before the request reaches its destination, it will
 * be rejected with a 483(Too Many Hops) error response.
 * A default Max-Forwards value 70 is used.
 */
public class MaxForwardsHeader extends Header
{
    /** Creates a MaxForwardsHeader with value=<b>SipStack.max_forwards</b>
     * (the default value is 70, as recommended in RFC3261) */
    //public MaxForwardsHeader()
    //{  super("Max-Forwards",String.valueOf(SipStack.max_forwards));
    //}

    /** Creates a MaxForwardsHeader with value=<i>n</i> */
    public MaxForwardsHeader(int n)
    {  super(SipHeaders.Max_Forwards,String.valueOf(n));
    }

    public MaxForwardsHeader(String hvalue)
    {  super(SipHeaders.Max_Forwards,hvalue);
    }

    public MaxForwardsHeader(Header hd)
    {  super(hd);
    }

    /** Sets Max-Forwards number */
    public void setNumber(int n)
    {  value=String.valueOf(n);
    }

    /** Gets Max-Forwards number */
    public int getNumber()
    {  return (new Parser(value)).getInt();
    }

    /** Decrements the Max-Forwards number */
    public void decrement()
    {  value=String.valueOf(getNumber()-1);
    }
}

